ANALOG DEVICES EVAL-LTC7890-BZ Evaluation Board, LTC7890, Synchronous Step Down Controller

EVAL-LTC7890-BZ evaluation circuit is a dual output synchronous step-down converter that drives N-channel silicon (Si) field effect transistors (FETs). The EVAL-LTC7890-BZ evaluation board features 100V logic-level Si FETs. It features the LTC®7890: a low quiescent current, high frequency (programmable fixed frequency from 100KHz up to 3MHz), dual step-down DC/DC synchronous controller, with a dedicated driver feature for GaN FETs, which can also be used to drive logic-level silicon FETs. To evaluate the LTC7890 with GaN FETs, refer to the EVAL-LTC7890-AZ evaluation board, which does 12VOUT at 20A and 5VOUT at 20A. The EVAL-LTC7890-BZ operates over an input voltage range from 16V to 72V, while the LTC7890 can operate up to 100V. The EVAL-LTC7890-BZ evaluation circuit produces two outputs: 5V and 12V, with up to 10A on each output. EVAL-LTC7890-BZ is configured with sense resistors for current sensing.

• 16V to 52V input voltage range (maximum component temperature <100°C, IOUT1 = IOUT2 = 10A)
• 5V typical output voltage, VOUT1 (VIN = 16V � 72V, VPRG1 = 0V)
• 30mVP-P typical output voltage ripple, VOUT1(AC) (VIN = 48V, IOUT = 10A)
• 12V output voltage, VOUT2 (VIN = 16V � 72V)
• 35mVP-P typical output voltage ripple, VOUT2(AC) (VIN = 48V, IOUT = 10A)
• 33.5mA input current (FCM, VIN = 48V, IOUT1 = IOUT2 = 0A)
• 500KHz typical switching frequency (P3 = DISABLE SS (SSFM OFF))
• 95.1% efficiency (VIN = 48V, VOUT2 = 12V, IOUT2 = 10A )